Method of producing objects with desired outline and surface



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METHOD VOF PRODUGING OBJECTS WITH DESIREDIOUTLINE AND SURFACE Filed May V2l. 1925 NVENTORI Patented Sept. 14, 1926. y

UNITED STATES PATENT OFFICE.

` -IVAR JOHAN EDVARD GREN .AND GrUNlNAR ROSENQVIST, OF UPIPSALA, SWEDEN.

,METHOD 0F PRODUCING OBJECTS WITH DESIRED OUTLINE AND SURFACE.

Application med May a1, 1925, seran Nb.

This invention 4relates to a method of producing objects having desired outline and surface by means of galvanoplastic preclpltation of the metal from which the article is to be made by galvanoplastic precipitation in separable, permanent metal molds.

A further object of the invention is to deposit a galvanoplastic precipitation of the metal from which the desired article is to be made in a separable annular metal mold formed of springy material, whereby after the article is formed the mold can readily be opened or taken apart thereby to permit the easy removal of the completed articleI therefrom without injury to the mold.

A further object of the invention is to provide a process by means of which designs or openings having any desired `form of edges may be produced on the article dur- Ving the precipitation on the wall of the mold.

With the foregoing and other objects in view, the invention consists in the novel procedure hereinafter more fully described and particularly pointed out in the claims.

In the drawings acompanying and forming part of this specification- Fig. 1 is a plan View of a preferredform of annular metal mold containing an article that has been formed therein' in accordance with the present invention;

Figs. 2 and 3 are respectively a side elevation and a top plan view of a modified form of mold;

Fig. 4 is a. fragmentary view illustrating a development of a portion of the inner surface of a mold used in carrying out the I process;

Fig. 6 is a tranverse .sectional view taken approximately on the line V-V of Fig. 4; and

Figs. 6 and 7 are views similar to Figs. 4

and 5 respectively, but showing the surfaceE of the mold after the precipitation has taken place, Fig. 7 being on a somewhat larger scale.

Themold 1 shown in Fig. 1 is preferably formed of resilient material and is slit longitudinally and provided with a pair of flanges 2 perforated for the reception of fastening bolts (not shown) or other means for securing'the flanges 2 together thereby to close the mold. With the mold in closed position, that is to say, with the flan es 2 drawn together and retained in contiguous relation, ,the metal from which the article is to be produced is deposited on the inner surface suitable decorative edge.

31,958, and in Sweden -January 31, 1921.

upon the' flanges 2 will spread` apart as shown in Fig. 1, thus leaving the article free to be lifted out of the mold.

The mold la shown in Figs. 2 and 3, instead of being formed of one piece, comprises three sections, each provided with a pair of flanges 2a, the flanges of each section being secured to the flanges of the adjacent sections, thus forming a complete mold. The mold in this form may be made either of rigid or resilient material, as desired, it being understood, of course, that if made of resilient material, when the fastening means is released, the resiliency of the mold will Efnake it easier to remove the article thererom.

In Figs. 4 to 7 is illustrated the manner design or opening which it is desired toA form in the exterior surface of the completed article. Figs. 6 and 7 show the surface of the mold after the precipitation has been accomplished, and it will be noted that these strips form weakened portions in the precipitated metal, whereby the metal included between these strips may be removed. For example, the precipitation 6 included within the design outlined by the strip 4 can readily be removed, whereby an opening is formed inthe article, which opening is bounded by an edge ofthe required configuration. In like manner, by the removal of the precipitation.7 the article may be provided with a The preci itation 8 indicates the body of the complete article after the precipitations 6 and 7 have been removed.

It will be understood, of course, that the mold itself may be produced in any desired manner, such for instance. as by galvanoplastic precipitation.

be used repeatedly any number of times, as distinguished from a mold which must be destroyed in order to removey the articleV therefrom.

Having thus described our invention, what we claim is:

1. A method of producing hollow articles with desired outline and surface, which consists in making galvanoplhastic precipitations in a separable, permanent, metal mold.

2. A method of producing articles With desired outline and surface, which consists in making galvanoplastic precipitations in an annular resilient metal mold, said mold being slit longitudinally.

3. A method of producing objects with desired outlineand surface, which consists in attaching Vnarrow strips of insulating mate: rial to the surface of a metal mold, said strips being so disposed as to form a re-I quired design, and making galvanoplastic precipitations on said surface.

' 4. A method of producing objects with desired outline and surface, which consists in forming metal molds of elastic material and slitting said molds longitudinally, attaching to the surface of said molds narrow strips of insulating material disposed so as to form a required design, and making galvanoplastic precipitations on said surface.

In testimony whereof We have signed our names to this specication.

WAR Jol-IAN EDVARD AGRE. GUNNAR RosENQVIsT. 

